glsl: Compile error if fs uses gl_FragCoord before first redeclaration

Section 4.3.8.1, page 39 of GLSL 1.50 spec says:
  "Within any shader, the first redeclarations of gl_FragCoord
   must appear before any use of gl_FragCoord."

GLSL compiler should generate an error in following case:

vec4 p = gl_FragCoord;
layout(origin_upper_left) in vec4 gl_FragCoord;

void main()
{
}

Signed-off-by: Anuj Phogat <[email protected]>
Cc: <[email protected]>
Reviewed-by: Ian Romanick <[email protected]>

0 files changed, 0 insertions, 0 deletions